What types does the function expect and return?

Question

RepoPilot · Accepted Answer

The `escapeStringRegexp` function expects a **string** parameter and returns a **string**.

This is defined in the TypeScript declaration file [index.d.ts:L16]:

```typescript
export default function escapeStringRegexp(string: string): string;
```

At runtime, the function also enforces this type constraint in [index.js:L2-L4]:

```javascript
if (typeof string !== 'string') {
	throw new TypeError('Expected a string');
}
```

So if you pass anything other than a string, it will throw a `TypeError`.

FOLLOW_UPS:
- What RegExp special characters does it escape?
- How does the function handle edge cases like Unicode?
- Can you show an example of the escaping output?